from flask import Flask, request

app = Flask(__name__)


@app.route('/', methods=['GET', 'POST'])
def home():
    return '<h1>Home</h1>'


@app.route('/signin', methods=['GET'])
def signin_form():
    return '''<form action="/signin" method="post">
                  <p><input name="username"></p>
                  <p><input name="password" type="password"></p>
                  <p><button type="submit">Sign In</button></p>
                  </form>'''


@app.route('/signin', methods=['POST'])
def signin():
    if request.form['username'] == 'admin' and request.form['password'] == 'admin':
        return '<h3>Hello, admin!</h3>'
    return '<h3>Bad username or password.</h3>'


if __name__ == '__main__':
    app.run()
